Physics – Space Physics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ncimc...5..488c&link_type=abstract
Nuovo Cimento C, Geophysics and Space Physics, vol. 5C, July-Aug. 1982, p. 488-494. Research supported by the Consiglio Nazional
Physics
Space Physics
8
Gamma Ray Bursts, Sediments, Supernovae, Thermoluminescence, Dust, Irradiation, Mediterranean Sea, Ocean Bottom
Scientific paper
Thermoluminescence (TL) from the different layers of a recent core drilled in the Tyrrhenian Sea have been measured in order to see whether gamma-ray bursts produced by historical supernova explosions would be stored in the core as TL enhancement. The sedimentation rate previously measured at 0.115 cm/yr by the Pb-210-Ra-226 method allows the profile of TL to be obtained for the last 1500 years. Striking peaks are seen during the years for which historical supernovas are recorded. The times agree within the fluctuations due to possible variations in the sedimentation rate. A working model of the process is described in which the dose contribution to the different layers of sediment comes partly from dust irradiated in the upper atmosphere by gamma rays produced by the SN bursts. The model's estimate of the energy influx for the period 1050-1060 gives a million erg/sq cm. If the distance to the Crab is two kpc, the burst energy at the source was about 4 x 10 to the 50th erg.
Bonino Gianfranco
Castagnoli Cini G.
Miono Sh.
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